Knob attachment



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KNOB ATTACHMENT.

1 T( .'503,198. Patented Aug. 15, 1893'.

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NITED STATES PATENT OFFICE.

CHARLES F. DOEBLER AND CHARLES K. BRYANT, OF HARTFORD, CoNNECTICUT.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 503,198, dated August15, 1893.

Application filed June 28, 1892. Serial No. 438.307. (N model.)

To all whom it may concern:

Be it known that we, CHARLES F. DOEBLER and CHARLES K. BRYANT, citizensof the United States, residing at Hartford, in the county of Hartfordand State of Connecticut, have invented certain new and usefulImprovements in Knob Attachments, of which the following is aspecification.

This invention relates to that class of knobattachments in which theknob is secured to the spindle by means of clamping devices; the objectbeing to provide a knob-fastening fixable to the spindle through anintermediate spindle-clamping thimble, or sleeve, whereby the knob-stemmay be firmly held at the knob-end thereof, as hereinafter more fullyset forth.

In the drawings accompanying and forming a part of this specification,Figure 1 is a longitudinal section of a knob-attachment embodying ourpresent improvements. Fig. 2 is a similar sectional view, showing amodification of certain details. Fig. 3 is a sectional view, in line aa, Fig. 1. Fig. 4. is a side view of the knob-carrying sleeve, orthimble, through which the squared spindle is fitted to slide.

Similar characters designate like parts in all the figures.

In our improved knob-attachment, the spindle S is or may be of the usualsquared crosssectional form shown in Fig. 3, and of uniform diameterthroughout the length thereof.

On this spindle is fitted the spindle-clamping sleeve 2, centrallyperforated throughout the length thereof by a squared hole fittingfreely on the spindle S. One end of said sleeve 2, which is externallyround in cross-section, is threaded at 3; and the other end, 4, thereofis formed tapering; said sleeve is also slotted at one or more points(in the present instance at four points, as shown at 5 in Fig. 3) forthe greater part of its length, so that said conical end 4. may beclosed onto the spindle.

The knob K is furnished with a tubular knob-stem, 6, the knob-end ofwhich stem is bored tapering to fit on the aforesaid conical end 4 ofthe sleeve while the projecting end of said stem is bored and threadedto screw onto the thread 3 of said sleeve. As a means for holding theknob-stem in place on the sleeve, the latter member is also providedwith a check-nut, 7, (which may have the usual hexagonal form at 8,)screwed upon said threaded portion 3 and bearing against the extreme endof said stem 6, as will be understood by inspection of Fig. 1.

When assembling the knob-attachment, the spindle is put through thedoorD and the escutcheon-plate P (Fig. l) and the sleeve with thecheck-nut 7 thereon is then slid upon the spindle and against theescutcheon-plate, as shown in said Fig.1. The knob-stem is now, by meansof the knob K, screwed onto the sleeve until the conical seat 90f saidstem closes the forward end 4 of the sleeve firmly onto the spindle,after which the check-nut is screwed up against the end of the knobstemto firmly bind this in place on the sleeve.

The clamping of the sleeve upon the spindle being effected just at theinner side of the knob, (instead of at the opposite end of theknob-stem, as heretofore done in knob-fastenings of this general class,)securely holds the knob against lateral pressure of the hand, so thatpulling or prying upon the knob in the opening of the door tends in theleast possible degree to loosen the fastening. In practice, we find thisknob-fastening to be strong and reliable, and readily adjusted. Also,our fastening has the important advantage that the same knobs may beapplied to different sizes of spindles by the simple substitution of asleeve, 2, having its central bore of the required size. In practice,the knob and the check-nut being usually of expensive andhighly-finished bronze, while the sleeve 2 is made of relativelyinexpensive iron or steel, this feature of changeability is a matter ofconvenience and utility.

In the modification shown in Fig. 2, the escutcheon-plate P is replacedby the ordinary rose, R, constructed and arranged in combination withthe other parts to cover and protect the check-nut 7, which in this caseis made shorter than shown in Fig. 1; but this modification is asclearly within the scope and limits of our invention as the preferredform of our improvement shown in Fig. 1.

By means of our presentimprovements, the knob while in use is held fromrotation relatively to the spindle by the clamping of its threadedinternal stem upon the external thread of the sleeve Without the use ofany key or squared part engaging said stem.

By reference to the drawings,it will beseen that the compressible sleeve2, has a smooth tapered or conical end and has screw-threads of uniformdiameter formed upon its opposite end, Which screw-threads extend fromthe extreme end to a point near the center of said sleeve, terminatingnear the point where the taper begins, and that the knob-stem has atapered smooth internal bore to fit the tapered end of the sleeve andhas internal screwthreads of uniform diameter to correspond with and fitthe screw threads upon said sleeve.

By the construction herein described, it will be apparent that thesleeve operates strictly after the manner of a conical chuck, while theknob is rigidly held against any lateral or lever-like motion of thesleeve by means of the two bearings of the knob-stem, one at the innerend thereof upon the cylindrical thread of the sleeve, and the other atthe outer end thereof on the conical compressible portion of the sleeve.Also it will be observed that the threaded portion of thesleeveisnoncompressible, it being rigid and turning within the threadedend of the knob-stem with a uniform tit, and that the binding-nut, thescrew-threads of which uniformly fit the threaded end of the sleeve,will, when screwed outward, bind against the end of the knobstem andfirmly hold the said knob-stem against movement upon the sleeve.

Having thus described our invention, we claim In a knob-attachment, thecombination With the spindle, of the compressible-sleeve, one end ofwhich is tapered or conical and the other end of which has screw-threadsof uniform diameter formed thereon, an internally tapered knob-stemhaving screw-threads to correspond with, and fit the screw-threads uponthe sleeve, and a check-nut having internal threads of uniform diameterto lit and turn upon the sleeve to bind the knob-stem upon said sleeve,substantially as described.

CHARLES F. DOEBLER. CHARLES K. BRYANT.

W'itnesses:

FRANCIS H. RECHARDS, HENRY L. RECKARD.

